diff --git a/tools/ios.py b/tools/ios.py
index 11d606b9..aac59d24 100644
--- a/tools/ios.py
+++ b/tools/ios.py
@@ -2,7 +2,7 @@ import os
 import sys
 import subprocess
 import ios_osxcross
-from SCons.Variables import *
+from SCons.Variables import BoolVariable
 
 if sys.version_info < (3,):
 
diff --git a/tools/linux.py b/tools/linux.py
index 099a0484..b10f188d 100644
--- a/tools/linux.py
+++ b/tools/linux.py
@@ -1,4 +1,4 @@
-from SCons.Variables import *
+from SCons.Variables import BoolVariable
 from SCons.Tool import clang, clangxx
 
 
diff --git a/tools/windows.py b/tools/windows.py
index e64695ae..a1644a97 100644
--- a/tools/windows.py
+++ b/tools/windows.py
@@ -3,7 +3,7 @@ import sys
 import my_spawn
 
 from SCons.Tool import msvc, mingw
-from SCons.Variables import *
+from SCons.Variables import BoolVariable
 
 
 def options(opts):